/* Trang công khai (SSR) – màu thương hiệu #1161ab (chính) và #f58535 (nhấn). Không phụ thuộc JS để hiển thị. */
:root{--p:#1161ab;--p-dark:#0b4a85;--p-soft:#e8f1fa;--a:#f58535;--a-dark:#8f3d06;--ink:#1b2430;--muted:#556070;--line:#dfe5ec;--bg:#f6f8fb;--card:#fff;--r:14px;--max:1160px}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:var(--p);text-underline-offset:3px}
a:hover{color:var(--p-dark)}
:focus-visible{outline:3px solid var(--a);outline-offset:2px;border-radius:4px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:10px 14px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.narrow{max-width:780px}
.center{text-align:center;padding:64px 16px}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(1.65rem,4.5vw,2.5rem);letter-spacing:-.01em}
h2{font-size:clamp(1.25rem,3vw,1.6rem)}
h3{font-size:1.05rem}
p{margin:0 0 1em}
.muted{color:var(--muted)}
.lead{font-size:1.1rem;color:var(--muted);max-width:70ch}
.eyebrow{display:inline-block;background:#fdeadb;color:var(--a-dark);border-radius:99px;padding:2px 12px;font-weight:600;font-size:.875rem}

/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 18px;border-radius:12px;border:2px solid transparent;font:inherit;font-weight:600;text-decoration:none;cursor:pointer;background:#fff;color:var(--ink);line-height:1.2}
.btn-primary{background:var(--p);color:#fff}.btn-primary:hover{background:var(--p-dark);color:#fff}
.btn-accent{background:var(--a);color:#1b1206}.btn-accent:hover{background:#e47321;color:#1b1206}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}.btn-ghost:hover{background:var(--p-soft);color:var(--ink)}
.btn-sm{min-height:44px;padding:0 14px;font-size:.95rem}
.btn-lg{min-height:52px;padding:0 26px;font-size:1.05rem}
.btn-block{width:100%}
.link{background:none;border:0;padding:8px 2px;min-height:44px;color:var(--p);text-decoration:underline;cursor:pointer;font:inherit}

/* header */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:saturate(1.4) blur(6px)}
.bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;min-height:64px;padding-top:6px;padding-bottom:6px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:1.1rem;min-height:44px}
.brand b{color:var(--p)}
.nav{display:flex;align-items:center;gap:4px}
.nav a,.menu summary{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;border-radius:10px;color:var(--ink);text-decoration:none;font-weight:500;cursor:pointer}
.nav a:hover,.menu summary:hover,.nav a[aria-current]{background:var(--p-soft);color:var(--p-dark)}
.menu{position:relative}.menu summary{list-style:none}.menu summary::-webkit-details-marker{display:none}
.menu summary::after{content:"▾";margin-left:6px;font-size:.8em}
.menu ul{position:absolute;top:100%;left:0;min-width:220px;margin:4px 0 0;padding:6px;list-style:none;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 30px rgba(20,40,70,.12)}
.menu ul a{display:flex;width:100%}
.search{display:flex;gap:6px;flex:1 1 220px;max-width:420px;margin-left:auto}
.search input,.hero-search input,.filters select,.code-card input,.dlg input,.dlg select,.dlg textarea{min-height:44px;padding:8px 12px;border:1.5px solid #b9c3cf;border-radius:12px;font:inherit;background:#fff;color:var(--ink);width:100%}
.tools{display:flex;align-items:center;gap:8px}
.langs{display:flex;gap:2px}.langs a{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:10px;text-decoration:none;color:var(--muted);font-weight:600;font-size:.85rem}
.langs a[aria-current]{background:var(--p-soft);color:var(--p-dark)}
.auth{display:inline-flex;gap:6px}

/* hero */
.hero{background:linear-gradient(180deg,var(--p-soft),var(--bg));padding:40px 0 28px}
.hero-grid{display:grid;gap:28px;align-items:center}
.hero-search{display:flex;gap:8px;margin:18px 0}
.actions{display:flex;flex-wrap:wrap;gap:10px}
.code-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:0 10px 30px rgba(20,40,70,.07)}
.code-card label{display:block;font-weight:600;margin:12px 0 6px}
.code-card .btn{margin-top:14px}
.err{color:#b42318;font-weight:600;margin:6px 0 0}

/* khối */
.block{padding:28px 16px}
.block .head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.cat-grid{list-style:none;margin:0;padding:0;display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}
.cat-card{display:flex;flex-direction:column;gap:4px;min-height:96px;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--a);border-radius:var(--r);padding:14px;text-decoration:none;color:var(--ink)}
.cat-card:hover{border-color:var(--p);border-left-color:var(--p)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.grid-ad{grid-column:1/-1}
.card{display:flex;flex-direction:column;gap:6px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.card :is(h2,h3) a{color:var(--ink);text-decoration:none}.card :is(h2,h3) a:hover{color:var(--p)}
.card .btn{margin-top:auto;align-self:flex-start}
.clamp{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin:0}
.meta{display:flex;gap:12px;font-size:.875rem;color:var(--muted);margin:0}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none}
.chips.big{margin:0 0 14px}
.chip{display:inline-flex;align-items:center;min-height:28px;padding:2px 10px;border-radius:99px;background:var(--p-soft);color:var(--p-dark);text-decoration:none;font-size:.85rem;font-weight:600}
.chips.big .chip{min-height:44px;padding:0 16px;font-size:.95rem}
.chip.alt{background:#fdeadb;color:var(--a-dark)}.chip.ok{background:#e3f6ea;color:#14663a}
.about .ticks{padding-left:1.2em}.about li{margin:.25em 0}
.cta{background:var(--p);color:#fff;text-align:center;padding:40px 16px;margin-top:20px}
.cta h2{color:#fff}.cta p{opacity:.95}

/* trang */
.page-head{padding:18px 0 6px}
.crumbs{padding:14px 0 0;font-size:.9rem}.crumbs ol{display:flex;flex-wrap:wrap;gap:4px;list-style:none;margin:0;padding:0}
.crumbs li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--muted)}
.crumbs a{display:inline-flex;align-items:center;min-height:32px}
.filters{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-end;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px;margin:12px 0 18px}
.filters label{display:flex;flex-direction:column;gap:4px;font-size:.85rem;font-weight:600;flex:1 1 140px}
.pager{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:26px 0}
.pager a,.pager span{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0 12px;border-radius:10px;border:1px solid var(--line);background:#fff;text-decoration:none;color:var(--ink)}
.pager .cur{background:var(--p);border-color:var(--p);color:#fff;font-weight:700}.pager .gap{border:0;background:none}
.empty{padding:28px;background:var(--card);border:1px dashed var(--line);border-radius:var(--r)}
.prose{margin:26px 0}.prose p,.prose li{max-width:75ch}
.faq{margin:26px 0}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:8px 0;padding:0 14px}
.faq summary{cursor:pointer;min-height:48px;display:flex;align-items:center;font-weight:600}
.faq details p{margin:0 0 14px;color:#2a3442}

/* tài liệu */
.doc{display:grid;gap:24px;padding-bottom:30px}
.answer-first{font-size:1.1rem;background:var(--card);border-left:5px solid var(--p);border-radius:0 12px 12px 0;padding:14px 16px;box-shadow:0 1px 0 var(--line)}
.facts{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;margin:16px 0}
.facts dl{display:grid;gap:10px 18px;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));margin:0 0 14px}
.facts dt{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}.facts dd{margin:0;font-weight:700}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin:0}
.preview{padding-left:1.4em}.preview li{margin:.4em 0}
.doc-side h2{font-size:1.1rem}.rel{padding-left:1.1em}.rel li{margin:.5em 0}
.report{margin-top:20px}

/* quảng cáo: giữ chỗ cố định để không nhảy bố cục */
.ad-slot{display:block;min-height:100px;margin:18px 0;border:1px solid var(--line);border-radius:12px;background:#fff;position:relative;overflow:hidden;padding:18px 10px 10px;text-align:center}
.ad-slot[hidden]{display:none}
.ad-slot.ad-sidebar{min-height:260px}
.ad-slot .ad-label{position:absolute;top:2px;left:8px;font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.ad-slot a.ad-link{display:flex;gap:12px;align-items:center;text-align:left;text-decoration:none;color:var(--ink);min-height:70px}
.ad-slot img{width:96px;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:8px}

/* footer */
.site-footer{background:#0f2a45;color:#d3deea;margin-top:40px;padding:34px 0 12px}
.site-footer .grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.site-footer h2{font-size:1rem;color:#fff}.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer a{color:#d3deea;display:inline-flex;align-items:center;min-height:36px}.site-footer a:hover{color:#fff}
.site-footer .brand{color:#fff}.site-footer .brand b{color:#8cc4f5}
.site-footer .copy{margin:18px auto 0;font-size:.875rem;border-top:1px solid rgba(255,255,255,.14);padding-top:12px}
.site-footer .link{color:#fff}

/* cookie + hộp thoại */
.cookie{position:fixed;left:12px;right:12px;bottom:12px;z-index:60;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 14px 40px rgba(10,30,60,.22);padding:14px 16px;max-width:760px;margin:0 auto}
.cookie[hidden]{display:none}
.cookie .row,.dlg .row{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.dlg{border:0;border-radius:16px;padding:20px;width:min(480px,94vw);box-shadow:0 20px 60px rgba(10,30,60,.35)}
.dlg::backdrop{background:rgba(10,20,40,.5)}
.dlg label{display:block;font-weight:600;margin:10px 0}
.dlg form{display:block}

@media(min-width:900px){
  .hero{padding:64px 0 40px}
  .hero-grid{grid-template-columns:1.25fr .85fr}
  .doc{grid-template-columns:minmax(0,1fr) 300px;align-items:start}
  .doc .crumbs{grid-column:1/-1}
  .doc-side{position:sticky;top:84px}
}
@media(max-width:640px){
  .bar{gap:6px}
  .search{order:5;flex-basis:100%;max-width:none;margin-left:0}
  .tools{margin-left:auto}
  .auth .btn-ghost{display:none}
  .nav{order:3}
  .menu ul{position:fixed;left:12px;right:12px;top:auto}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Vùng bấm tối thiểu 44px cho mọi liên kết ngoài đoạn văn (WCAG 2.5.5) */
.card :is(h2,h3) a,.rel li a,.facts dd a,.doc-side p a,.crumbs a,.site-footer a,.head a,.page-head a,.empty a,.hero .actions a,.about a{display:inline-flex;align-items:center;min-height:44px}
.card :is(h2,h3){margin-bottom:0;font-size:1.05rem}
.rel{list-style:none;padding-left:0}
.crumbs li{display:inline-flex;align-items:center}
.site-footer a{min-height:44px}
.faq summary{min-height:48px}

/* ===== Cân đối bố cục (v2) ===== */
.faq,.prose{margin-block:28px;margin-inline:auto}
.doc .faq,.doc .prose,.doc-main .faq{margin-inline:0}
.wrap.faq,.wrap.about{max-width:860px}
.block{padding-block:34px}
.grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.cat-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
@media(min-width:1000px){
  .grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .cat-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(min-width:640px) and (max-width:999px){.grid,.cat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:639px){.grid,.cat-grid{grid-template-columns:1fr}}
.card{padding:18px;gap:8px}
.card .btn{align-self:stretch;margin-top:auto}
.facts dl{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:639px){.facts dl{grid-template-columns:repeat(2,minmax(0,1fr))}}
.hero-search .btn{white-space:nowrap}
.hero h1{max-width:20ch}
.site-footer .grid{grid-template-columns:1.4fr 1fr 1fr}
.site-footer nav:nth-of-type(1) ul{display:grid;grid-template-columns:1fr 1fr;column-gap:16px}
.site-footer a{min-height:44px}
@media(max-width:639px){.site-footer .grid{grid-template-columns:1fr}}
.page-head{padding:24px 0 10px}
.doc{gap:28px}
.doc-main>section{margin-top:28px}
.doc-main h2{margin-bottom:.7em}
.doc-side{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.doc-side h2{margin-top:0}
.chips.big{gap:8px}
.cta{padding:48px 16px}
.hero{padding:48px 0 36px}
@media(min-width:900px){.hero{padding:72px 0 52px}}
@media(min-width:1000px){.cat-grid{grid-template-columns:repeat(var(--cols,3),minmax(0,1fr))}}

/* Thanh đầu trang: logo trái · menu giữa · ngôn ngữ + tài khoản phải */
.bar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px 16px}
.bar .brand{justify-self:start}
.bar .nav{justify-self:center}
.bar .tools{justify-self:end}
@media(max-width:760px){
  .bar{grid-template-columns:1fr auto;grid-template-areas:"brand tools" "nav nav"}
  .bar .brand{grid-area:brand}.bar .tools{grid-area:tools}
  .bar .nav{grid-area:nav;justify-self:center;width:100%;justify-content:center;border-top:1px solid var(--line);padding-top:4px}
}
.brand span{white-space:nowrap}